Which of the following $3 d -m e t a l$ ion will give the lowest enthalpy of hydration $(\Delta_{ hyd } H )$ when dissolved in water?

  • [JEE MAIN 2022]
  • A

    $Cr ^{2+}$

  • B

    $Mn ^{2+}$

  • C

    $Fe ^{2+}$

  • D

    $Co ^{2+}$

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  • [AIIMS 2002]

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